PEG-15 Butylene Glycol Diisostearate

PEG-15 Butylene Glycol Diisostearate 1
photograph
AKA: Polyethylene Glycol 15 Butylene Glycol Diisostearate, Emollient
Plant-Derived
Cleanser
Emulsifier
Not Clean
OriginDerived from isostearic acid (a branched fatty acid) and butylene glycol, then chemically modified. Produced through ethoxylation, where polyethylene glycol chains are added via reaction with ethylene oxide.
PEG-15 Butylene Glycol Diisostearate is the polyethylene glycol derivative of the diester of Butylene Glycol and Isostearic Acid containing an average of 15 moles of ethylene oxide.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Cleansing Surfactant
Emulsifier
Removes Impurities
Mixes Oil & Water
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
4
CIR
Safe as used
Pregnancy
Yes
Concentration Guide
CIR lists it as not reported to be in use.
CIR · report published 2022
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: CosIng · EWG · CIR